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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feef9f84e6925c66c6f805991c5da7462bc27b51a29b29305a2beb5d48e5b1a9' 
  AND token = 'OaGFdPEPr69GmXqnHRxuvRsnhANb8Kssw0jCNXfawwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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