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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7883df29b4b1787fa3ff1c616de38b332afa8b4b2bf8fa22f268ed2a6860f29e' 
  AND token = 'FXq0J8VdL8Z5WoaVYdiuv7fwpEW3hv/s2tWstOzdZsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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