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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da61bb5cf24f92ae2a719019a0dcbe464faf737a11a0d222784f90c2f7425b52' 
  AND token = 'OHornEqDRQ4eG/5ZWbtZOL+R9tNEomG5Vnl9XPPuQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}