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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8be98f8e601e2192766b52e0e73d0a0f62b0e9e92a58386580609b5b706d70' 
  AND token = 'zOs8RL5hpJITDwklEDk46LoYAujjC+4pQ1tC8DdKdp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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