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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df74c21f941ed629573aeef2ff9cd86a7faef315b5d2cbac08d7dcc636407a9b' 
  AND token = 'XPfpATLQnrBd6jjyJhmJXhqk4r/Hm4U2luB+9Db1bTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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