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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0709124e3afc3c07108fb3f678fec82af5e0c97832449b0036b6736bb7ed197' 
  AND token = '6pdRtxG4mAllT4xCxbw5l+8EdWMbxUZGUAcb3Kyy3EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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