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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab64a768a9d1b42b6d3aaeccd91e91ad97e50c8a8a2891e82c91e941addf244d' 
  AND token = '15WyXKCNx6RF0vqL4nyGmhNLwt8LO+923BrKmh+3Cm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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