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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbb69a852ef5beeb934209776310e7f0cb0502d93fd88972ce56701a84eb8f5' 
  AND token = 'oCrd5+nUIGVQyYqs4i/m3yS+MDtoyTNebty7f/WAh8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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