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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe52df6beacce6a732e1d24bd3b369fc7b2a0ea74f439448be80c8feaf07a2b' 
  AND token = 'Vp32LxcCQcPstlN8ENhrf3SxNn1ojvyvkwF5FI2b6Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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