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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91d56000ce867aae9d9c37c2156afd4fc89549e7607edd779fc7f3ff88572e6' 
  AND token = 'rWYPjHGPXfQjQw283l8BIqzL6KxpKEwoE8UIxdgEE4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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