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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b38ed0b19bd6b91c605639e64c66e1abb683cdfd437937d84de094b76509d7' 
  AND token = 'SVa9VTT3PN3wEXybDNiK6FJ5z/JCg9J0DHXT89bfCPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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