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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68acbcf0ecc886a767428bd307ce9e15df6f26c97dec8c073bf389138589ff39' 
  AND token = 'iB9TLKClzj0Lv7B6PHyCfuRTCnwAUwRnCe08V+B7MR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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