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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3ee67a2f7a75d5b216e1943a5bbd1ae57ca94a3fe185ff42775d527f90ecb9' 
  AND token = 'wDdUuHxQ0tAE7XKL/qNJnV+j7XTm/ohp36mAN7dRyZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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