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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dc2335c280a0334c6321a05c7b828dc4b608b39985429afb17e3afd3f9ea4f' 
  AND token = 'r5awHKgDe76e0JWVFkgpEGO4h67wclyGJ6rpBk1/7qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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