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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e1a809ef4d27b582bed0e3e5348406e8dd5c74b75d82c84e2afa55302a9d67' 
  AND token = '9xaPCsvhhIX466ELf+JrxtkrY4q+MkzGlNhW4a7rJnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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