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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90345595c888abff024e9024d0d9ea5a0783a894dcc1035f30de65f73b5d8639' 
  AND token = 'o+OZFSNxLXDxpQKIk+0pw7Ny/J/dIQWpe183P/q5qTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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