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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cac523f6a14b1e6486f77733af3ee06d9cc14f6248f064dac7ea570243d5d82' 
  AND token = 'iNE1xfDAdApOsZL3qNfVHVb9Sbn5MhT+AzTDv/6/JT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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