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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd49f8283bcf36d0ad82dcd3ae2c07a7e479eb3830d9d01e8275b6846f065f0d' 
  AND token = '8NOs26CR44yhp0kp/r6X68nxz2lEV/R8tIBSktIPH/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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