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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed7412776a6c63e39e62207cc6a4b32ca2ebb42890fbf7e3e0896b243c67f8b' 
  AND token = 'RXHaV2soVGWL3etMNLLSEqw5/bS5D1YSV7L5CXnzHtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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