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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f984b7d1cb1a03bde1afdf21fb140426f4ed0b604dbe82d2241df8d4bd7f1d' 
  AND token = 'omBgqv7Ui60pmazEeYQb1e8Z6m5FypXR2H6LemDn1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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