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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1571cf30b9238d5236520cdddcb1c8e7dc24e0ccd1d5606626581c4e3c88e108' 
  AND token = 'zFWPdGdDlt4edMO6KYhoA4Ffa1SggqoBe5aEQiG6M8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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