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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c213da4cec507a29ca71d6d9ff4c4ab243ed3fb6643f4a9968dfe37b00fa93ad' 
  AND token = 'PNJgWclVDkXJ9ZvBEaAKeQHM0wzH5D/qMClrEaZet+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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