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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad92dc6514efc7a67e23679784ea88eb37acfa49cc1c26aa6e2342057a551da0' 
  AND token = 'z7d5F518k2cY4BPaIN8wLCWdfZtIPuphb63iqnXeR9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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