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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5134719168f7b96c94ed23d67d0e7d7a05fce7efdd9f14302138a0a9ba65cf' 
  AND token = 'h06UCJu1On29ShTpJDJ6kRz1+p4IMtZs0qk07AqAF4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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