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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daf802089421d95b42a0687d87b96f439cfe26c2262c2767723670415b00c9b' 
  AND token = 'lEp+q2mALrS3Y7Jpg/fgl/0u2WbrAMycBBI+o2XokS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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