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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57684b5d6d174f35730ddbb7c9f4c4eae8141d782a3db0690df0d7b77d1943c0' 
  AND token = '+rP2QxfSxnULPxDkgC/AtbjvEzjMEXsOq2DhP64G2Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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