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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea59b176d1a8b69920cc7814e6ab8697d1d1ecda4518fd0b3742096e0302362' 
  AND token = '7+TPxkbBzRTau1MBUI3RYOTF5JpsaZa+yqMr7CgqhLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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