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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08fca7ae267ee46c48d9d2dfe7bafc658a733ddafee0e67584a04b5a4435e84' 
  AND token = 'G/+5dz9QAmejRBNjpm1GhAflqSP7mMLJuocHO+pgtCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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