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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc10c64509f3f3d2bf78fa76b5d512566165e0b200a964cff7eb36a51388798' 
  AND token = 'f7+m4CExjtwrTSEADurhcX8h7bTW8tPwOZP+ExHGMH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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