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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91de4774f0151937aba0ea4231b50fe76e78c2e29fe09c7067b5f4b188c91d2' 
  AND token = '/OKOaRdRf7+J7MLAjaLQ2e+9IkQ/sFmyHCb9kSQwISk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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