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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d2120882029fd9281631058bff0bd868d9f273798ffef68bf66dbdc737ae7e' 
  AND token = 'tfk2uZnqHJE+ItYCr1r1Zl8YCNnvab4xlVcDYZtIal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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