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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e803813b95af4ea3e03e2f8f4c3229d89c8030e4fb6b7c850800e5901c390b' 
  AND token = '9UtJjeo7GaZPaceI8IIsCIrEHo/srEb2ruXzWx9uSp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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