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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d33f81194ddca9384274596ba351a26527f88d1c3e50c4eb455f06f321396db' 
  AND token = 'v/1yVkmL72b2eDQD8OsoXaeQGxow/UHB8Z5N+GlkBFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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