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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebe28bf4bf1607877825ad551200f2036a7fd6d3ad77cab718e33f23cc6a2d0' 
  AND token = 'sIKIAHWmktOi2GCNuKknu9bolH3IDiIdB2eGlUQiP1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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