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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db4d1ce60231112952aad73703b3c58b2b59609c0e6ea4f3a8ae9af8815d2c6' 
  AND token = '/y5rDC02r2f2BMr2z55Ko/0pR5pviPP8a5Q5tAoH1hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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