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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1372c81c80a44375ba3a7a9aa73d5f479e22edf50fd1c42304919789dc141ee' 
  AND token = 'K1nMYzYie/C1UMfHX09Fg2sM49qNu4CsbNhj+eTV/kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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