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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222039d3f31753aee0712705bd390fcd1a135f7c00ea5ed4e273f5e1c02431bf' 
  AND token = 'ancFD4QGnUUdD6yE279c3rf+TL1JyhTkEZeoiavdQqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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