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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b341ed877d350a974d20161b2cd34f5231ac55a0c60ce3d9f95e774283d96c' 
  AND token = 'SUO9vvCpZfOUAelYrQdTQ75m6ZDW8rfwVhfvRQq1E4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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