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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0e55f00bd3205ba81304bd946f8a0407ed48f2f0011e5145c6de65550e8faa' 
  AND token = '+hrwXEziU6frdIJhvOvHAz7K+7oRoTDPt82Q9SCJDms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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