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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9164d1d7f420d1845354620c86a3bcd3249d25596791272c5dcb99f342dd09d' 
  AND token = 'alRTq5izR1calntAdviLdRY9YvXbwdAVxSnasEN3L+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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