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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063d3a9fb6b09bfcd60610a56e31eaa2d7a26e4d4ba2814b8a26d59d9e27931a' 
  AND token = 'IrHRKNe7ATMxYbcLWC4IeH06i8TCj+MBpq1DHweYATE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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