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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f35f63c8ce8907f55a0f4b827bd0b70dc8dc2cc9a238caf724e0ad9d0f8bf7e' 
  AND token = 'eUCmHDh5UE8GJ3N/FDJCRmTnM3lUdbb2nsbOn8wOqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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