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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077a9f3598f6d53f76a8b1c366e920c20987546251b6ce16956c90d4b96ca333' 
  AND token = '2JcR/kdQAPUce5Qhm1MHi1y7drNbWn4cdH9to+dsuOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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