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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b6b94c88cfe570199cb5e205fb5a14ca59794033f45b07c3aa3439dab3d557' 
  AND token = 'cl6jwXVnDh2a33x1MHV7jHna5L2c5QnEsXNiFsdO3yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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