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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6281d9c4df4101b735d5ec6b73f4316391609f8b57fdac837d0ff80dfda20e' 
  AND token = 'InDp0M2amxxHPiNKm0NibmcJ8+RRXHLCes/OJdktbTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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