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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713eec11fb2612accce25a930a646743418c14c0a9483504a4fb52d39a80783e' 
  AND token = '8yrgugrjBP1UG6S/WFWKEEohag7kQEgcKYy+RN2kt2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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