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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375cf7429e308ab2d121ae67742cce8a7e5659efee1b78ad59ab0bfacde9f830' 
  AND token = 'jl+gxZmGr+H3DoPCmzEk62qfffdLLi9ngNrZORLJT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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