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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a010c82ce1b4f7f5b7e4eba6e02b0b3396283d92f12fe59e36467cc7b70fa82' 
  AND token = 'nbkV+acqgj+w4jfdoxmZGrXJEd6eajaqcuG0PEykJJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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