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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6a05dc1919f9e703d9307338a75409eb86b756e822fcc6a3996faf93c47086' 
  AND token = 'xnZfIZwTVEdb5z772HyIGQa6w5SUixWv071KO5yrY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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