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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f83020e5377961e7d5cc8f7a1709fe8840ec3b962efa4d7399aba8f19d1603' 
  AND token = 'AhvUWQG2BCh/v1JzUk1HB6iyA/i4rRdDcCwKJzNoh7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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