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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7da9f7a2aad69ebfffc8ea525ba0af6199056ea1752d66354261c2876a5df02' 
  AND token = '5jOHbMqbjhEOiWljTy2NaWPqK23jAx4XBXZQvYs1aFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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