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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8264666cbc1b35b7f43b67a3befa2e54872e810c3f878fb67595fa4767e2fcb' 
  AND token = '4duWFjlzeih6cre/CgRFB2nvDSqdiUjn8SUIVUXYP2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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